<2% Matched Pair NOS GE 5 Star 5814A Tubes ECC82 12AU7

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One Tested Matched Pair of NOS 1957 & 1958 Premium GE 5 Star 5814A Vacuum Audio Tubes (ECC82 12AU7). I was able to test 50 of these GE 5814A 5 Stars. With that many available it was easy to create closely matched pairs by selecting pairs with similar test results. Features: Grey Plates Leftmost tube has Balanced Internal Triodes/Sections/Plates Matching Date Codes Triple Mica Plates for lower Microphonics Extra Support Rods for lower Microphonics USA Tubes Why buy from us? Our Core Values: Honesty, Transparency and Customer Service! 100% Positive Feedback, please read our customer's comments Fast Shipping! We try to ship the next possible shipping day after payment is received. Packaging: Tubes are well padded inside a sturdy cardboard box with many Glass "Handle With Care" stickers Inexpensive Shipping, please compare our rates! On request we will combine your multiple purchases into one low cost shipment to save you money. Just send us a note. Test results Calibrated Hickok 539B Test Results Tube Type / Model 5814AECC82 12AU7 5814AECC82 12AU7 Manufacturer GE Premium 5 Star GE Premium 5 Star Getter Location / Style Top - Horseshoe Getter Top Horseshoe Getter Plate Color Short Grey Plates Short Grey Plates Date Code 57-39Week 39 of 1957 58-46Week 46 of 1958 Shorts & Gas Test Passed Passed Plate #1Mutual Conductance (gm) 3100gm 3 100gm Plate #2Mutual Conductance (gm) 3100gm 3200gm BAD WEAK GOOD NOS Minimum Good* = 1950 Average New* = 3100 * Hickok "Minimum Good" and "Average New" specifications for the 5814AECC82 12AU7 tube type Matched Pair Analysis Report Calulated** Percentage of Difference* based on the test results Overall (Avg Both Sections) Plate/Section #1 Plate/Section #2 1.6% Mutual Conductance (gm) 0% Mutual Conductance (gm) 3.1% Mutual Conductance (gm) * Typically a good match is considered to be a 10% difference or less in Mutual Conductance which is measured in (gm). For Power tubes that consume a lot of power (current). A typical match would be 10% or less in regards to Plate current which is measured in milliamps (ma). We typically only include current draw mesurements in our listings when a tube type draws greater than 10 millamps of current. ** Calulated Percentage Difference formula = abs(((x1 - x2) / x2) * 100) Advantages that we offer at Vintage Amp and Radio Tubes: We buy in bulk and pass the savings on to you We leverage a network of tube buyers from across the country. We have thousands and thousands of Radio and Amp tubes in our current inventory We can offer tube matching and balanced dual section tubes. An Excellent Customer Rating that we intend to keep by providing you with: Excellent Communications Timely shipping after receiving payment (1-2 days is our goal) Transparent and honest tube testing results, not inflated numbers. Our 30-Day 100% Satisfaction Guarantee (see below) Our simple warranty: We believe each tube should have an appropriate warranty, regardless if it is used, NOS or NIB, we do not sell as-is. If you are not delighted with your purchase, let us know within 30 days after we ship and we will authorize the return of the tube. We may be able to provide another tube from our large inventory - your choice. To improve our quality, we would like to understand the reason for the return, but it is not a requirement. Returns must be the same item and include the original box in the same condition (if applicable). The item must be packed with the same care and use the original packaging materials. Purchaser must pay return shipping fees. When we receive the return, we will refund your purchase price (excluding original shipping fees) within 72 hours. We want you to be happy with your purchase, and will work with you if you have any concerns or problems.Please contact us to work out a mutually beneficial solution before writing negative feedback. We pride ourselves on being... read more

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